How to use the handprint.images.image_dimensions function in handprint

def _resized_image(self, file):
        (max_width, max_height) = self._max_dimensions
        file_ext = filename_extension(file)
        name_tail = '.handprint' + file_ext
        new_file = file if name_tail in file else filename_basename(file) + name_tail
        if path.exists(new_file) and readable(new_file):
            (image_width, image_height) = image_dimensions(new_file)
            if image_width < max_width and image_height < max_height:
                inform('Using reduced image found in {}', relative(new_file))
                return new_file
            else:
                # We found a "-reduced" file, perhaps from a previous run, but
                # for the current set of services, dimension are too large.
                if __debug__: log('existing resized file larger than {}x{}: {}',
                                  max_width, max_height, new_file)
        inform('Dimensions too large; reducing dimensions: {}', relative(file))
        (resized, error) = reduced_image_dimensions(file, new_file, max_width, max_height)
        if error:
            alert('Failed to re-dimension {}: {}', relative(file), error)
            return None
        return resized

def _normalized(self, orig_item, orig_fmt, item_file, dest_dir):
        '''Normalize images to same format and max size.'''
        # All services accept PNG, so normalize files to PNG.
        to_delete = set()
        file = item_file
        if orig_fmt != _OUTPUT_FORMAT:
            new_file = self._converted_file(file, _OUTPUT_FORMAT, dest_dir)
            if new_file and path.basename(new_file) != path.basename(file):
                to_delete.add(new_file)
            file = new_file
        # Resize if either size or dimensions are larger than accepted
        if file and self._max_dimensions:
            (image_width, image_height) = image_dimensions(file)
            (max_width, max_height) = self._max_dimensions
            if max_width < image_width or max_height < image_height:
                new_file = self._resized_image(file)
                if new_file and path.basename(new_file) != path.basename(file):
                    to_delete.add(new_file)
                file = new_file
        if file and self._max_size and self._max_size < image_size(file):
            new_file = self._smaller_file(file)
            if new_file and  path.basename(new_file) != path.basename(file):
                to_delete.add(new_file)
            file = new_file
        return Input(orig_item, orig_fmt, item_file, file, dest_dir, to_delete)